| oomycetes | Group of fungi in which the mycelium is nonseptate, i.e. Lacks cross walls and the nuclei are diploid. Sexual reproduction is oogamous. (18 Nov 1997) |
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| oomycosis | A mycosis caused by fungi belonging to the class Oomycetes; e.g., rhinosporidiosis, pythiosis. (05 Mar 2000) |